prepare phase failed ERROR: The following required ports are in use: in R12.2

txkADOPValidations.log
Error:
Lines #(572-576):
-----------------------------
ERROR: The following required ports are in use:
-----------------------------
9040 : Forms Port
Lines #(599-603):
[applpat@ebsx01appd06 scripts]$ netstat -nlp|grep -i 9040
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp        0      0 :::9040                     :::*                        LISTEN      -
Solution: 
Kill process id by root user
Find out the processes PID that opened tcp port 9040, enter:
# fuser 9040/tcp
Sample outputs:
9040/tcp:             3943
netstat -nlp|grep -i 9040
no process found